DCS Command System User’s Guide
Introduction To DCS
Recommended Wiring Method - Older Transformers
Older transformers, like the Lionel postwar ZW or KW models
employ a bi-metallic strip to act as a circuit breaker. The strip
responds to heat as high current flows through the transformer. If
enough heat is generated by the high current, the strip will open the
circuit and prevent further current from flowing out of the trans-
former. The bi-metallic strip is not a precise overload protection
device and does not measure the current. As a result, it may not trip
when excessive amps are being generated by the short circuit. Should
the strip thus fail to trip, excessive and potentially harmful current
could be sent through the TIU.
MTH therefore recommends that any user employing an older transformer that does not
meet today’s U.L. standards install inline fuses or circuit breakers between the transformer
and the TIU input channels. An AG3C “fast-acting” or “fast-blow” fuse rated at 15 amps
would be suitable protection. These can be obtained from most hardware or electronic
stores including Radio Shack. Users will also need an inline fuse holder to house the fuse.
Radio Shack sells a heavy duty model, part number 27-1217.
Recommended Wiring Method - Electronic Transformers
Any transformer employing two parts, a brick
(step down transformer) and a controller (used
to vary the voltage output) may cause opera-
tional problems due to low power or poor DCS
signal. To correct this problem, MTH recom-
mends connecting only the brick to the TIU
inputs. In addition, check the output voltage of
the transformer; it should not exceed 22 volts
(or 18 volts if lighted cars are used on the track).
When using the Z-500, Z750 or
Z1000 electronic type transformer use
an adapter cable, MTH item 50-1017,
to connect the brick directly to the
TIU input as shown below. DO NOT
use the controller portion of an elec-
tronic type transformer.
13
Controller
Brick
TIU
Brick
TIU/Barrel Jack Adapter Cable
(50-1017)
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